• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6

# The factors affecting the deflection of a cantilever when weights are added onto the end.

Extracts from this document...

Introduction

Physics Investigation

I am trying to find out about:

The factors affecting the deflection of a cantilever when weights are added onto the end.

What I think will happen:

I think that as the weights are added to the cantilever, the deflection will increase.

I think this will happen because:

I think the deflection will increase because gravity will push down on the cantilever and weights while the atoms in the cantilever will be resisting this force: -

I know that MOMENT = FORCE(N) X DISTANCE

This means that the moment of the weights is the distance from the bench (or pivot) multiplied by the number of Newtons attached to the hook. As I know that the moment increases as more weight is added, I can use this to back-up my prediction by stating that more weight (or moment) causes more deflection e.g. I predict that weight is directly proportional to deflection. This could also be likened to a bimetallic strip, which will bend more as it is increasingly heated or cooled.

The

Middle

To this when weight is added ~~~~~~~~~~~~

## PLAN

To do this experiment, I will need:

1. A wooden meter rule
2. A G-Clamp + small block of wood
3. A Hook
4. 7, 1 Newton weights
5. A small coil of string

First fit this equipment up like so:

The string is used to attach the hook to the ruler. String is useful for this, as it is thin and can be placed at a measured position with fairly good accuracy.

The block of wood goes in-between the G-Clamp and the ruler to stop the pressure damaging the wood. If I were to set-up the ruler without the G-Clamp I could not call it a cantilever, as a cantilever is defined as a projecting structure, fixed in position and direction at one end, and free at the other.

In my preliminary experiment I found that there was no way to hook the weights onto the ruler and that using too many weight would snap or split the ruler.

I used this information in my "primary" experiment by using string a certain distance from the bench and also adding no more than 7 Newtons onto my ruler.

Conclusion

The 3rd and 4th results increase the surface area less that the 1st to 2nd and so do the averages of them.

Also, the oxygen readings fluctuated so taking three recordings and averaging them out was a beneficial idea.

My prediction was correct.

EVALUATION:

The test could have been more reliable if the concentration of acid was kept the same each lesson as this caused higher or lower results depending on which concentration was used.

The pieces of potato were overlapping on top of each other in the test tube, which detracted from the accuracy of the result as the experiment was trying to make a correlation between surface area and oxygen produced. A conical flask with a thin mesh just above the bottom would have helped keep as much area exposed as possible.

The odd/fluctuating results were mostly due to the acid concentration problem as the overlapping happened every time.

I am more certain that my conclusions are correct because I have checked and recorded my results and found no unexplainable anomalies.

I could do more research into enzymes and how fast they convert their substrate into the components to enable me to work out the experiment using maths and practical experience.

This student written piece of work is one of many that can be found in our AS and A Level Mechanics & Radioactivity section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Mechanics & Radioactivity essays

1. ## Factors affecting the speed of a trolley Travelling down a ramp.

The bigger the gradient the more spaced out the dots will be because the trolley is travelling at a faster rate. The smaller the gradient the less spaced out the dots will be, indicating that the speed of the trolley is travelling at a slower rate.

2. ## Investigating the factors affecting tensile strength of human hair.

from the same age group Equipment 2 X Clamp stand - to hold everything upright 2 X Clamp - to hold paperclip/hair and ruler 100cm ruler - to measure how far hair stretches before it breaks (tensile strength) 2 X paperclip - to hold hair and mass 10kg masses with

1. ## The aim of this investigation is to investigate the effect of adding varying weights ...

To make this investigation a fair test the only variables will be the force exerted on the ruler and the distance along the ruler that force is. All my results will be to one decimal place as well as the averages taken from each set of three results.

2. ## Science 1 Investigating thedeflection of a cantilever.

The reason, we did this is so we could hang our weights onto the end of the string and take our measurements with out the string slipping or falling off. Before we took any measurements we had to take a few safety precautions, the reason for this is because if

1. ## Use of technology in a hospital radiology department. The department of imaging is one ...

If the receptionist was not present then patient would walk in at any time and the department would be unorganized. Radiology department, cleaners and porters' relationship, radiology department is responsible for helping patient and identifying internal organ. The cleaners support the whole department by cleaning and meet hygiene standards.

2. ## Multi-bladed Pumps. Does the number of propellor blades affect the efficiency of a ...

Apparatus tested underwater by pressurising with air using a bike pump. Leaks located by bubbles escaping where seals were incomplete. How to get water to flow from the water reservoir into the propeller cavity, without providing any extra pressure

1. ## Force and Newton's three Laws

Now the observation switches, I'm watching you looking at me, and am still being accelerated in the same direction. You all appear to come towards me being accelerated in the opposite direction. I think 'Aha! The 1st law should work so you people should feel a push.'

2. ## The physics involved with a rollercoaster.

The frictional force is the force that prevents the car from reaching as high a point which it started. ACCELERATION I have decided to talk about the acceleration in detail because this is the main physic principle on the ride and the way the water acts as a stopping force for the large accelerating force coming down.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to